Spring-dividers



J. W]. STRANGE. DIVIDERS AND GALIPERS.-

Patent-ed Sept. 4 1860 uwrok:

UNITED STATES PATENT OFFICE.

JOSEPH W. STRANGE, OF BANGOR, MAINE.

SPRING-DIVIDERS.

Specification of Letters Patent No. 30,009, dated September 1 1, 1860.

T 0 all whom it may concern:

Be it known that I, JOSEPH WV. STRANGE, of Bangor, in the county of Penobscot and State of Maine, have invented new and useful Improvements in Dividers and Calipers; and I do hereby declare that the following is a full and exact description thereof, reference being had to the accompanying drawings, and to the letters of reference marked thereon, in which Figure l is a perspective view of my dividers. Fig. 2 is a sectional view of the yoke used for dividers. Fig. 3 is a perspective view of my calipers, and Fig. 4 is a sectional View of the yoke used for calipers.

The nature of my invention consists in a peculiar arrangement and combination of the inclined plane and screw relatively to the other parts of the dividers and calipers, and each to the other, by which the legs of the dividers and calipers are relatively contracted or allowed to diverge.

To enable others skilled in the art to make and use my invention I will proceed to describe its construction and operation.

I construct the spring and legs of my calipers and dividers in any of the usual forms with the exception of one peculiarity hereinafter described; but instead of using the usual appliance for adjusting the degree of divergence of the legs, I use a sliding yoke Y, which is formed to slide upon the legs L, the legs passing through two orifices H in the yoke. This yoke is operated and adjusted by means of the screw rod S, which is formed with a male screw thread which works in the female screw formed at c in the yoke. The rod S is formed with a fixed collar C which bears against the inside of the bow of the dividers or calipers and serves to hold the rod in position. The top of the rod, which passes through the bow, is surmounted with a knob K, which is movable, and which if desired may be unscrewed and placed upon the lower end of the rod S.

The legs of dividers I form with an outward curve or angle-as shown in Fig. l for a twofold reason, first that the sliding of the yoke Y may move the legs to any de sired relative position, and, second, that in all their various degrees of divergence the legs may be more nearly parallel. The degree of divergencewhen shut-of that part of the legs of the dividers and calipers traversed by the yoke, being the measure of the influence of the screw in changing the position of the points.

F ig. a shows the form of the yoke which I use for calipers, it being made in that form in order that it may be readily applied to or detached from the calipers.

Among the advantages of my invention are its compactness, there being no projecting screw as in the usual form; it is perfectly balanced, the screw S being the exact center of weight and form, and the desired position of the points is never obscured by the projections usual upon dividers made in the common formwhile the same number of turns of the same screw will carry the legs through as great a space-as in those made in the usual form, and by changing the form of the legs the operation of the screw may be increased or diminished according as a greater or less degree of nicety of adjustment may be desired in the instrument.

I do not claim dividers or calipers as or dinarily constructed, nor do I claim any of their constituent parts as ordinarily constructed and arranged, but

What I do claim is-- The combination and arrangement of the sliding yoke Y and the screw S, when applied to calipers and dividers, substantially as and for the purposes.

J. WV. STRANGE.

Witnesses J. S. JENNnss, A. L. SIMPSON. 

